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There was a blog post written about the business logic of shopping cart, which used cookie s and redis to store the data of shopping cart of the unregistered and logged-in users. Although the business logic has been well completed, the redundancy of modern codes is very serious, and they are not Python-specific enough. Today let me use python-s ...

Note that it takes a long, long time to read this article. This article is about Spring IOC Source Parsing (Part I) In the sequel, the previous article introduced how to start Spring using XML, and then tracked the creation of Bean Factory containers, the parsing of configuration files, the registration of beans, and so on. 12. finishBeanFactor ...

Links to the original text: https://www.jianshu.com/u/8f2987e2f9fb The function defined in the class is the function attribute of the class, which can be used by the class, but only a common function is used, which means that the parameter r ...

Spring provides two ways to inject values at runtime: Property placeholder Spring Expression Language (SpEL) 1. Property placeholders 1.1 Injection External Value 1.1.1 Using Environment Normally, we put some values in the configuration file and then inject them into some fields when the program runs. Suppose we have a test.properties configu ...

This chapter describes the lighted event process of keyboard and mouse. KeyPress event KeyPress events occur when a key on the keyboard is depressed Precise Description: Press a key and we will trigger the KeyPress event with focus at this time. Th ...

Articles Catalogue HTML CSS JavaScript usage Grammar (Weak Type) BOM DOM Object-oriented Cavas: Drawing pictures debugging ajax Bootstrap (css framework) jQuery (js Tool Library) selector retrieval dom operation animation Ajax HTML Html t ...

In data processing, it is often necessary to associate the related attributes in Excel with spatial data. The data format in Excel is relatively free. Sometimes the data in Excel table contains special symbols such as line breaks. When the data c ...

Problem When writing Unit Test in Java, the expected value of Unit Test is usually read in expectResult.json from the test/resources directory by tools and deserialized by JSON serialization tools to obtain the expected results of Unit Test, and compared with the actual results of the test. However, if the classes used for deserialization are d ...

Articles Catalogue Lagrange Interpolation Method for Missing Value Processing Data frame merge Merge on Index Axial connection Merge overlapping data Reshaping Hierarchical Index Conversion of Length-Width Format Remove duplicate data Data Conversion Using Functions or Maps Data standardization Mini ...

Links to the original text: https://www.cnblogs.com/yuzhanhong/p/9180212.html python decorator is a function used to expand the function of the original function. The purpose is to add new functions to the function without changing the origi ...